Chinese hackers breach US officials' emails in targeted espionage campaign

Chinese hackers breached the email accounts of US Ambassador to China Nicholas Burns, Assistant Secretary of State Daniel Kritenbrink, and Commerce Secretary Gina Raimondo.
The cyber espionage campaign is believed to have compromised hundreds of thousands of US government emails and provided insights into US thinking on China.
The hack was discovered in mid-June and has been attributed to a Beijing-linked group that exploited a vulnerability in Microsoft's systems.
The Biden administration is investigating the breach and determining how to respond to this incident amid tense US-China relations.
China has denied involvement in the hacking operation, as it has done previously with other state-sponsored cyber intrusions.